importer: work on infrastructure for third-party import from other sites

Change-Id: Ib4e5e4d543a1b2a913b99fa0a4d92f1a5b94c5dc
importer: rudimentary manual start/stop of importers

Change-Id: I753f3d6e4a241c803f79446889169c4a25f1bdf3
Merge branch 'master' of https://camlistore.googlesource.com/camlistore into media
third_party/lldb: cherry-pick fix from https://github.com/cznic/exp/commit/44f1cc3f1eb4626d0ae89dfdb3fe6c7a888a0171

Update camlistore.org/issue/233

Change-Id: I4bd342a295aa6b8943ad7ff664007dad9ab6b904
First little bit of Flickr importer.

Change-Id: Ia42b07a81b01904f5722d06653c4bf9de2e81c64
Merge "First little bit of Flickr importer."
Merge branch 'master' of https://camlistore.googlesource.com/camlistore into media
sync